Toast walnuts in 300 F (150 C) oven until fragrant. Let cool completely. Melt roughly chopped chocolate in a bowl over steaming pot of water on low heat. Stir on heat until melted and smooth. Toss the walnuts and almonds a few at a time in the melted chocolate, and transfer onto a parchment paper to set.

Mix cinnamon and cocoa powder in a small freezer bag. Toss the set chocolate covered nuts in the powder until evenly coated.